Hubble Space Telescope: 1996 -- 1997
When Galaxies Collide
Two spiral galaxies can be seen colliding here in the heart of the Arp 220 galaxy. This provides the spark for a burst of star formation. The bright, crescent moon-shaped object is a remnant core -- a cluster of 1 billion stars -- of one of the colliding galaxies.
NASA/Hubble Space Telescope
   
 
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